The essence of Wegener's idea was sound, based on some scientific observations. Which of the following supported his theory?

Scientists found that the continents were moving apart from each other due to magma rising out of mid-ocean ridges, and they called this

The Earth's continents were once connected in one giant continent called

The Earth's crust is divided into 7 major plates, which include all of the continents. Along which two plates do we see major earthquake activity?

Wegener's old theory, called sea floor spreading, was found too simplistic because it did not explain how the continents would move. It was replaced by a theory called

Plate tectonics is our current theory of how the movement of continental masses relates to the movement of ocean basins. This movement explains many phenomena, such as

Plate margins are places where much activity occurs. Earthquakes occur, for example, along convergent margins, where plates are

Volcanoes occur in similar locations to earthquakes, and are common along plate boundaries. Sixty percent of volcanoes occur surrounding the Pacific Ocean, a location called

Plate tectonics can also be the direct cause of forming

Plate tectonics, or the movement of pieces of Earth's crust, is thought to be caused b

Ovulation typically occurs on what day of the cycle?

Different women have menstrual cycle of different lengths

The lining of the uterus starts to grow thicker after

Which hormones stimulates the build up of the endrometrium?

The source of FSH in the body is…

Which hormone signals ovulation?

What does ovulation mean?

Where does implantation of the fertilized egg usually take place?

Which of the following is not one of the phases of the menstrual cycle in female?